Characteristics of insertion loss of transmission line with equal line length due to rectangular aperture size in the dual backplanes

This paper presents the characteristics of insertion loss of a two-wire, equal in length, transmission line crossing different sized rectangular apertures in infinite ground backplanes. The FDTD method is used to determine the characteristics of the backplane insertion loss of the transmission line from the load section in accordance with the backplane aperture size. The results show that the insertion loss and gain are related to the specific frequency ranges when the horizontal length and vertical length are close to the transmission line. The measurements of insertion loss are performed to verify the theoretical analysis.